Pipe connection or boot



May 29, 1923. 1,457,126

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May 29, 1923.

' 1,457,126 A. G. SCHERER PIPE CONNECTION 0R BooT Filedune 21, 1922 Patented May 29, i923g Unire slr "T5S,

ALBERT er.v SGHERER, or czerreaero,v ILLINoIs-.nssIGNoB To EXCELSIOR-strain scannen COMPANY, yor CHICAGO, ILLINOIsA aceros-AnemiaY OF; ILLINOIS.

PIPE CONNECTION *Oiav Boofr.A

Application filed. June 21, 1922. 'Serial No-.U569,859

VTio all whom t may concer/na' Be it'known that I, ALBERT G. SCHERER, a citizenv of the United States, residing at Chicago, in the countylof Cook and Stateof Illinois, have invented a'j new andvuseful Irn-y prove-Inent in a'Pipe Connection orBoot, of which the following is a specification.

My present invention has relation to iinprovements in 'doublewall boots lfor doublewall hot air duc-t or stack. Hot air duct. or stack is employedyin the heating and ven'- tilating art .to provide conduit between the joists in the 'floors and between studding in the walls of buildings to convey the airto the portion Of the'building `into which it is desired to discharge it orfroin which itisL desired to draw it, and to permit' off't-he greatestcapacity of this vduct under thesel conditionsit is made ofl rectangular crosssect'ionso as to lit between the joists and `the stu'dding. The connection between the lowermost portio-n ofthe rectangular section system and the furnaces, or means for withdrawing' the air, is made through what is technically known asa boot, one end whereof is designed 'for assembly with the duct of rectangular section, whilethe other end of the boot is provided with a collar adapted to assemble with a round pipe running to the 'furnace for heating o-r Afor eX-` haustingjthel air. 1

l 'Especially in the` conduction of heater air it has been 4found the better practice' 'to make the duct of two walls spaced from each other so as to provide around the inner hot air carrying wallan' airl insulation which pre#V vents the loss of heatduring Ithe passage of the air, and also prevents conduction of heat to the Vjoists l'and studding' between which the'du'ct is'installed and thereby elinr. inates a "re hazard. It is also the better practice to inake 'the boot withldoi'ible` walls. When double-wall bootsw'ere first made it was the .usual practice to. make both the inner and 'outer 'walls of the saine with angular edges and with fiat or plane walls.

Y Later bootsweredesignedin which the walls were tapered from the Iround Collar` with which the round pipe assembled to the angular end which lassembled with the stack.`

The angular form of boot had the advantages of strength and economy in manufae ture, and the tapered form of boot, especially with reference to the inte-rior wall, had thev advantage of offering less friction to the conducted air as there-were no corners Present which veilld permirent@ formation of [ed the' air. Y ,e ,Y My present invention ,consists iii-providinga'doublewall boot witha taperedfindies, and thereby irnpedethe flow terior walli, and flat angularv exterior "walls,f

and *the advantages of this structure over thewprlor structures are thatfwhile jIjretain theadvantage of the tapered structure in .so

Vfar asconductionis concerned, I have in? creased the insulating `space .aroundthe linner wall; I have greatly increased `the strength of the structurejb'y cornbininggthe tapered with the angular rflat vvallsf'andfI have also effected a Inaterialeconomy iIr-theA manufacturing cost ofthe article. Iattain the ,aforementioned objects .I and resultslbyj means fof. the structure illustrated in'jfthe. accompanying 'fdra'win'gs,y in ,which-4- Figgl is a perspective of a boot'enibody-- ing my invention ,showingv its assembly with.

fragnientsv of rectangul-arfand cylindrical sections ofpipe.y e "Fig, 2 is a central vertical section thereof. Fig. 3 is a side elevation of the: .boot

detached 'freni the stack, a portion ofthe adjacent outer wall being broken' away to' i disclose the interior arrangement'. A

Fig(` 4c is al fragnental top plan :of the upperporti-on ofthe boo-t,A

V'Fig. 5 is a horizontal sectio-ntaken online 5-15, "Fig.' l. Fig 'isa Fig. l. Thelinterior walls of my irnproved v.boo

horizontal'se'ction yOnline G-f, A u

are formed of what may lconveniently'be regarded as ya' rear piece o-r section .7 and frontp-iece orfsection 8 which are developedupon wellknown*geometrical principles sol that when their longitudinal edges Avar esecured together,.preferably by `doublefseain` ing,`as at'9, one end will be of circular fornnfk and the ltop end with bends 10,10, provided adjacent v-theupper edges of sections? and 8 will'be of rectangular cross-section. To the peaninggy a circular element or l.collar 11,v the ends whereof are secured by rivets 12,

Yround vend of sections Tand 8 is secured vby seannng, in this clasertechnically knownvas l or in any otherl suitable way, and 'the lower edges wh'ereof, both for stiffness and finish,vv

adjustment of the rectangular end to proper dimensions the corners of the portion of the `is rolled, as at 13. In order to facilitate the f l boot of rectangular cross-section are cut back to permit ot adjustment in thelinal operations of manufacture.

About collar 11 and close against 'the connection with sections 7 and 8 is disposed just in iront and below the upper angular lportion ot the `iront inner wall. To the front edge of sheet 14 and the .front edges oit the ysides is seamed the front outer wall 17.' The rear, sides and front outer walls are then formed with shoulders 18 and car ried still higher and then bent downwardly and inwardly, as at 19, to contact with the rectangular' portions ot the inner walls. rIhese walls are then carriedupwardly and over the upper edges ot the angular portionsv ot the inner walls to which they are suitably secured. I have illustrated the securing ct the top of the outer walls and included inner wall with diagonal crimping 20. It will also be seen that I have illustrated the'tormation in the outer walls ot the locking bead 21 illustrated in my previous Patent ilo. 1,085,303 ot January 27, 1914.

The edges of the outer walls forming the corners ot the portions which are adapted to assemble with the portion of the inner y pipeoic rectangular section are cut away,

as at 22, and to close the cut away portions in -both theV inner and outer walls, insert between the inner and outer walls corner pieces 23 which are secured in placeby the Idiagonal crimping which also secures the outer and inner walls together. I have also illustrated in the outer side walls 16 Apunched out straps 24 which are adapted to receive strips or" metal to be nailed to the adjacent joists or studding, but this detail iformsv no portion of my present invention, although boots with tapered exterior walls could not employ this Jfeature with the same -facility.

It will now be seen from the foregoing discussion and description, taken in connection with the drawings, that I have provided a hoot which is inn no way inferior to the tapered boot in conductivity of air, but which is stronger, cheaper to make and provides increased insulation against the escape of heat over either style of boot heretofore upon themarket.

What I claim is:

1. A doublewall boot for hot air duct having an annular collar, an inner wall tapering from said collar to an opposite end of rectangular section, and an outer casing of tlat walls through an end wall of which said collar extends, the side walls of said outer casing adjacent the rectangular portion ot the interior structure being formed with shoulders and united with the walls ot the interior structure.

2. A boot for lair duct comprising two Vtapering walls, one` ot said walls being of rectangular cross-section throughout, and the other of said walls being cylindrical at one `end and merging into the rectangular` shape of the other wall at its opposite end.

3. A double-wall boot for air duct comprising an outer wall of rectangular crosssection throughout and tapered towards its top, and an inner wall ot cylindrical crosssection at its lower end and tapered upwardly and' merging into a rectangular cross-'section at its upper end parallel with the adjacent portion of said outer wall.

A boot tor air duct comprisinga cylindrical collar, an inner wall connected at its lower end to said collar and tapered toward its opposite end to a rectangular crossesection, an outer wall spaced 'from said 'inner wall; said outer wall being of rectangular cross-section throughout and tapered Atowards its upper end, a transverse plate extend-ing around the cylindrical portion ot said structure andconnected at its outer edges to said outer wall, and said inner and outer walls shaped to each other and crimped together at their upper ends.

5. A double-wall boot for air duct comprising anv outer wall of rectangular crosssectien throughout, an inner wall of cylindrical cross-section at its lower end and merged into a rectangular cross-section at its upper end; said inner and outer walls spaced apart and tapered upwardly and secured together at -their upper ends, a cylindrical collar secured to the lower end oi: said inner wall, and a closure plate extending laterally trom said collar and having its outer edges secured to the lower edges or the outer walls. f

Signed at Chicago, county of Cook and State ot Illinois, this 13th day of June, 1922.

lVitness FLORENCE MITCHELL.

ioo 

